Mold-flask separator



Dec. 7, 1937. A. H. FELDMAN MOLD FLASK SEPARATOR Filgd Feb. 25, 1957 I A gwue/wio'b 42/20/617 fZaZzi/wiz Patented Dec. 7, 1937 UNITED STATES mews PATEN oFrl cE 6 Claims.

This invention relates to a mold-flask separator, and is designed primarily for use in'connection with'a dental mold andflask which are used when curing'or processing denture mateployed in anyconnection to 'the latter into the article.

rials, but it is to be understood that a separator, in accordance with this 'invention'is to be emforwhich it may be found applicabla j The object of the invention is to provide, in a manner as hereinafter set forth, means whereby a mold witha molded article therein maybe expeditiously withdrawn from a flask without injury Further objects of the invention are to provide, in a manner as hereinafter set forth, a separator which will overcome the necessity of diggingthe plaster or investment away from thesides' of a flask to free the mold; prevents any damage to molded article while removing the mold from the flask; overcomes thenccessity' of destroying the flask when removing the mold; overcomes the necessity of hammering the. side of. the flask in order to remove the mold; enables theme of the same flask for a period of years; permits of the flask being used indefinitely with as much accuracy as when the flask was first used; provides when used the saving in time and labor when separating the flask from a mold; provides for the expeditious separation of a mold from a-flask; requires .no special ability in thepositioning relative to a flask; in no manner alters the-form, size or shape of: the molded article; hasno chemical or physical effect upon the investing-material;

Further objects of theinvention are to provide,

in a manner as hereinafter set forth, a moldflask separator which is simple in itsconstruction, strong, durable, compact, readily installed with respectito a'flask, thoroughly eflicient-in its use, prolonging the life of a flask-easily handled as it is of light weight, and comparatively inex- I '45 pensive to manufacture.

To-the above ends essentially and to others which may hereinafter appear, the invention con-'- sists of the novel construction, combination and arrangement of parts as will be morespeciflcally be resorted to which fall within the scope of the V invention as claimed.

In the drawing:

Figurel'is a top plan view of a flask'hav'in its top or closure plate removed, the flask containing, a mold and showing the adaptation with the flask-and mold of the separator and with the latter being in extended position relative to the flask,

Figure 2 is a view similar to Figure 1 with the separator in anchored or non-extended positio-n,

Figure 3 is a cross sectionalyie'w ofa flask with its top, or closure plate removed, the flask containing a mold provided therein with a molded article to be cured and showing the adaptation with the flask and mold of the separator and with the latter being in the flask, v

' Figure 4 is a cross sectional view'of a closed flask containinga moldc'arrying a molded article to be cured and showing the adaptation of the separatorwith respect to the flask and mold,

Figure 5 is a fragmentary view infront elevation of" the separator innon-active position, Figure 6 is a section on line 6-43, Figure 5, and

extended position relative to Figure 7is'a Vertical sectional view of the separator when inactive position.

The flask, mold and molded article may beof any suitable form and those shown, are by way of example, for the purpose of illustrating the adaptation of the separator with respect to a flask and a mold. The separator is to be employed inconnection with any form of flask and mold for which it is found applicable. If the flask is of the closable top type the separator will be used in connection with the upper section of the flask. If the flask is of the closable open bottom'type the separator will be used in connection with the lower section of the flask.

The flask shown is indicated at 8 and. it includes a lower section 9 having an inverted frustotapered chamber Iil, a hollow open bottom and open top upper section ll having its inner edge l2 of frusto-tapered contour which at its bottom registers with the top of the wall of chamber IE, and a closure ortop plate I3. The flask 8 is shown by way of example as of semi-oval contour. The sections of the mold have registering openings, as is well known. The closure plate l3, as is well known, is formed with openings which are to align with the openings in said sections. As is well known holdfast means,.not shown are employed for extension into the aligned openings for detachably connecting the flask sections and closure plate together; It is to be understood that the flask employed may be of any form for which 7 the separator is applicable. The openings in the section H are shown and indicated at M. The openings in section 9 and plate l3 are not shown.

Within the flask 8 is an investing material 15 of any suitable type for the molded article It to be cured or processed. The investing material will be hereinafter termed a mold. The section 9 is first filled with the material IS, the molded article l6 then placed on the material 15 within section 9, the separator I! is then positioned throughout against the inner edge of section II and the latter is then filled with the investing material. The flask 8, mold and separator I! will then appear as shown in Figure 3, with the separator ll interposed between the mold and edge l2 and extended from the section 9. The extended portion of the separator I! is then bent outwardly to seat upon the top of section II, after which the closure plate I3 is anchored in position.

The separator l1 includes an outer and inner section l8, l9 respectively arranged in abutting relation. The section I3 is of tape-like form and constructed from sheet asbestos. The length of section l8 corresponds to the length of edge I2. The width of section 13 is less than that of section I9 and corresponds to the height of edge E2. The section I8 is to have one face thereof positioned throughout edge 12 in abutting relation to the latter. The other face of section I8 is to be positioned throughout against one face of section Hi. The length of the latter corresponds to that of section I8. The other face of section i9 is to bear against the mold. The section I9 is of tape-like form. The section I9 is formed from thin sheet metal or any alloy which fuses above the fusing point of the temperature employed for the curing or processing of the molded article. Preferably the section I9 will be formed of sheet brass of the desired gauge possessing a readily bendable characteristic. It is to be understood that the length of section l8 may be greater than that of edge l2 whereby the ends of section l8 will overlap when section I2 is in position. It is also to be understood that the length of section 99 may be such as to have its ends overlap. The

7 section I9 has its outer side marginal portion bent 1 and the edge 22 of section I8 corresponds substantially to the thickness of fold 20. That portion of section 19 which extends outwardly from flask section II! is indicated at 23 and includes the fold 2E3. When the portion 23 is bent outwardly to seat on mold section ll, the fold 20 not only seats on the top of section II but also on the edge 22 of section 18 (Figures 4 and '7). The extended portion 23 of the section 19 is formed with spaced slits 24 to facilitate the bending thereof. The slits 24 extend from the bend 25 to the edge 2! of the fold. The portion 23 constitutes a flange which is disposed at right angles to the remaining portion of the section l9.

After the completion of the curing or processing of the invested molded article, the plate l3 of the flask is removed and the portion 23 of the separator bent back away from the top of flask section i l. The mold is then held down by one hand and a knife or other suitable instrument inserted between the sections 9, ll of the flask to pry the flask section l I upwardly independent of the separator, as the latter does not adhere to the flask. The separator may now be peeled away from the mold.

The separator may be used for the lower portion of the flask, where deemed advisable, using the same technic as for the upper portion of the flask. When the separator is used for the lower portion of the flask, the portion 23 is bent against the lower edge of the lower flask section, the latter being open at its top and bottom. The portion 23 is secured in bent position by the bottom plate of the flask. After curing the molded article the bottom plate is removed, the portion 23 of the separator is bent away from the lower section of the flask, and said lower section may be removed from the mold using a downward pressure on such section.

The section I8 is termed a flask section liner. The portion 23 of section I9 is termed a retainer for sections 3, H). The remaining portion of section I9 is termed a mold protector.

The section 18 of the separator I! not only constitutes a heat insulating medium, but as it is resilient it acts as a cushion between section [9 and the flask.

What I claim is:

1. In a mold-flask separator, a bendable composite body formed of an outer section of cushioning material and an inner section of thin metallic material abutting the inner face of the outer section, said sections being of tape-like form, said inner section including a portion extending from one of the lengthwise edges of the outer section capable of being bent outwardly to overlap said edge, said portion being formed throughout with spaced parallel slits disposed in transverse relation with respect to the remaining portion of the said section.

2. In a mold-flask separator, a thin bendable metallic member of tape-like form, said member being formed with an inwardly extending fold bearing against a part thereof, said fold and a part being extended outwardly substantially at right angles to the remaining portionof saidmemher and being formed throughout with spaced slits.

3. In a mold-flask separator, a bendable composite body of tape-like form consisting of an outer section constituting a flask section lining possessing a cushioning characteristic and an inner section having a part thereof constituting a protector for the mold and its remaining part in the form of an outwardly directed flange providing a securing means therefor and for said outer section, said inner section being formed of thin metallic material and having the said remaining part thereof formed throughout with spaced slits and overlapping a lengthwise edge of said outer section.

4. In a mold-flask separator, a bendable composite structure formed of a strip of asbestos of tape-like form and a strip of thin metallic material of tape-like form positioned against and throughout one of the faces of the strip of asbestos, said strip of thin metallic material being of greater width than that of the asbestos strip and having a portion extended beyond one of the lengthwise edges of the strip of asbestos, said portion dispose-d at right angles to the remaining portion of said metallic strip and overlapping said edge, said portion being formed with inwardly extending spaced slits.

5. In a mold-flask separator, a bendable composite structure formed of a strip of asbestos of tape-like form and a strip of thin metallic material of tape-like form positioned against and throughout one of the faces of the strip of asbestos, said strip of thin metallic material being of greater width than that of the asbestos strip and having a portion extended beyond one of the lengthwise edges of the strip of asbestos, said portion disposed at right angles to the remaining portion of said metallic strip and overlapping said edge, said portion being formed with inwardly extending spaced slits, the said portion including an inwardly extending slitted fold seated on said edge.

6. In a flask separator, a bendable composite body consisting of an outer section of a material possessing insulating and cushioning characteristics and a metallic inner section abutting the inner face of the outer section, said sections being of tape-like form, said inner section including an outwardly directed slitted flange overlapping a lengthwise edge of the outer section, the said flange including a fold for seating on said edge.

ARNOLD H. FELDMAN. 10 

